Method for controlling pitch trouble in paper-making process
A barrier and resin technology, applied in papermaking, textile and papermaking, fiber raw material processing, etc., can solve the problems of reducing the specific surface area of inorganic particles and the potential adsorption performance of resin and pulp fibers, achieving low cost, convenient use and transportation, and preventing accumulation. Effect
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Embodiment 1
[0016] Preparation of hydrotalcite 1: 241 parts of AlCl 3 ·6H 2 O and 610 parts of MgCl 2 ·6H 2 O was dissolved in 4550 parts of deionized water and slowly added to the reactor at the same time with 2600 parts of diluted ammonia water diluted 3 times at a stirring speed of 500rpm. The pH value of the mixture was controlled between 9.5-10 and the addition time was controlled at 30 About minutes. After the addition, stirring was continued for 2 hours to obtain a mixed precipitate of magnesium hydroxide and aluminum hydroxide. The precipitate was crystallized under airtight conditions at 85°C for 12 hours, and then washed with deionized water centrifugation (4000r / min) for 3 times to obtain the interlayer anion as Cl - The volume average particle size of the synthetic hydrotalcite suspension is 0.72μm as measured by the Mastersizer 2000 laser particle size analyzer. Part of the synthetic hydrotalcite suspension is freeze-vacuum dried at -50°C and then ground through a 200-mesh sie...
Embodiment 2
[0020] Preparation of synthetic hydrotalcite calcined magnesium-aluminum composite oxide 1: The interlayer anion after freeze-vacuum drying in Example 1 is Cl - The synthetic hydrotalcite is placed in a muffle furnace, calcined at 500°C for 3 hours, cooled, ground, and passed through a 200-mesh sieve to obtain a magnesium-aluminum composite oxide. The magnesium-aluminum composite oxide was formulated into a suspension with a mass fraction of 1% with deionized water. After the suspension was properly dispersed by a shearing device, the volume average particle size measured by the Mastersizer 2000 laser particle size analyzer was 46.6 μm.
[0021] Resin barrier control: Prepare 2000 parts of domestic poplar wood chemical mechanical pulp containing 30 parts of absolute dry pulp according to Example 1, take 1000 parts of it, and add the resin acid with a mass fraction of 1% in Example 1 under stirring After mixing 3 parts of colloid, use concentrated hydrochloric acid to adjust the pu...
Embodiment 3
[0023] Preparation of synthetic hydrotalcite 2: Add 375 parts of Al(NO 3 ) 3 ·9H 2 O and 770 parts of Mg(NO 3 ) 2 ·6H 2 O is dissolved in 4255 parts of deionized water and slowly added to the reactor at the same time with 2600 parts of diluted ammonia water diluted 3 times at a stirring speed of 500rpm. The pH value of the mixture is controlled between 9.5-10 and the addition time is controlled at 30 About minutes. After the addition, stirring was continued for 2 hours to obtain a mixed precipitate of magnesium hydroxide and aluminum hydroxide. The precipitate was crystallized under airtight conditions at 85°C for 16 hours, and then washed with deionized water centrifugation (4000r / min) for 3 times to obtain the interlayer anion as NO 3 - For the synthetic hydrotalcite suspension, the volume average particle size of the synthetic hydrotalcite measured by the Mastersizer 2000 laser particle size analyzer is 0.93 μm. Part of the synthetic hydrotalcite suspension was freeze-vacuum...
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